Getting Started with Arduino Uno and HX711: A Beginner’s Guide

If you’re new to the world of Arduino and looking to explore the possibilities of building projects with sensors and data acquisition, then getting started with an Arduino Uno and HX711 module is a great way to begin. In this beginner’s guide, we will cover the basics of setting up an Arduino Uno board with an HX711 module to measure weight or force using a load cell.

The Arduino Uno is a popular microcontroller board that is easy to use and versatile for connecting to various sensors and modules. The HX711 is a precision 24-bit analog-to-digital converter (ADC) designed for weight scales and industrial control applications. By combining these two components, you can create your own projects like a smart scale, force sensor, or a load cell amplifier.

To get started, you will need the following components:

1. Arduino Uno board
2. HX711 module
3. Load cell
4. Capacitor (recommended for noise filtering)
5. Jumper wires

First, you need to connect the HX711 module to the Arduino Uno board. The HX711 module has four pins: VCC, GND, DT (Data), and SCK (Clock). Connect the VCC pin to the 5V pin on the Arduino Uno, the GND pin to the GND pin, the DT pin to the digital pin 2, and the SCK pin to the digital pin 3.

Next, connect the load cell to the HX711 module. The load cell has four wires: red (Excitation+), black (Excitation-), white (Signal+), and green (Signal-). Connect the red wire to the E+ pin on the HX711 module, the black wire to the E- pin, the white wire to the A+ pin, and the green wire to the A- pin.

If you are using a capacitor for noise filtering, connect one leg of the capacitor to the E+ pin on the HX711 module and the other leg to the GND pin.

Now, you can upload the Arduino sketch to measure the weight or force using the load cell. Here is a simple code snippet to get you started:

#include “HX711.h”
HX711 scale;

void setup() {
scale.begin(2, 3); // DT pin is connected to D2, SCK to D3

void loop() {
Serial.println(scale.get_units(), 1);

This code initializes the HX711 module with the pins connected to D2 and D3 and reads the weight or force data from the load cell. The weight data is then printed to the serial monitor.

With this basic setup, you can now start experimenting with different projects using the Arduino Uno and HX711 module. Whether you want to build a smart scale, force sensor, or a load cell amplifier, the possibilities are endless with these components.

So go ahead and dive into the world of Arduino and electronics by getting started with an Arduino Uno and HX711 today. Happy building!

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